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perf record: Add support to collect callchains from kernel or user space only

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One can just record callchains in the kernel or user space with this new
options.

We can use it together with "--all-kernel" options.

This two options is used just like print_stack(sys) or print_ustack(usr)
for systemtap.

Shown below is the usage of this new option combined with "--all-kernel"
options:

1. Configure all used events to run in kernel space and just collect
   kernel callchains.

  $ perf record -a -g --all-kernel --kernel-callchains

2. Configure all used events to run in kernel space and just collect
   user callchains.

  $ perf record -a -g --all-kernel --user-callchains

Committer notes:

Improved documentation to state that asking for kernel callchains really
is asking for excluding user callchains, and vice versa.

Further mentioned that using both won't get both, but nothing, as both
will be excluded.

Signed-off-by: yuzhoujian <yuzhoujian@didichuxing.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1559222962-22891-1-git-send-email-ufo19890607@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
yuzhoujian 2019-05-30 14:29:22 +01:00 committed by Arnaldo Carvalho de Melo
parent 22d4621987
commit 53651b28cf
4 changed files with 21 additions and 0 deletions
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11
tools/perf/Documentation/perf-record.txt
View File

@ -490,6 +490,17 @@ Configure all used events to run in kernel space.
--all-user::
Configure all used events to run in user space.
--kernel-callchains::
Collect callchains only from kernel space. I.e. this option sets
perf_event_attr.exclude_callchain_user to 1.
--user-callchains::
Collect callchains only from user space. I.e. this option sets
perf_event_attr.exclude_callchain_kernel to 1.
Don't use both --kernel-callchains and --user-callchains at the same time or no
callchains will be collected.
--timestamp-filename
Append timestamp to output file name.

4
tools/perf/builtin-record.c
View File

@ -2191,6 +2191,10 @@ static struct option __record_options[] = {
OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
"Configure all used events to run in user space.",
PARSE_OPT_EXCLUSIVE),
OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
"collect kernel callchains"),
OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
"collect user callchains"),
OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
"clang binary to use for compiling BPF scriptlets"),
OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",

2
tools/perf/perf.h
View File

@ -61,6 +61,8 @@ struct record_opts {
bool record_switch_events;
bool all_kernel;
bool all_user;
bool kernel_callchains;
bool user_callchains;
bool tail_synthesize;
bool overwrite;
bool ignore_missing_thread;

4
tools/perf/util/evsel.c
View File

@ -680,6 +680,10 @@ static void __perf_evsel__config_callchain(struct perf_evsel *evsel,
attr->sample_max_stack = param->max_stack;
if (opts->kernel_callchains)
attr->exclude_callchain_user = 1;
if (opts->user_callchains)
attr->exclude_callchain_kernel = 1;
if (param->record_mode == CALLCHAIN_LBR) {
if (!opts->branch_stack) {
if (attr->exclude_user) {